Grinding machine



April 22, 1930. A. R. BERCK GRINDING MACHINE Filed, April 10, 1928INVENTOR A21. BEBCK BY 7 ATTORNEY Wzssss Patented Apr. 22, 1930 Iosnrvin 3. 33301;, or HAsT-mes, NEBRASKA GRINDING 7 Application filedApril n,

r This invention appertains-to improvements in grindingmachinesgenerally, and more particularly to a type ofsuch machinesadaptedfor'use in \regrinding' scored and .worn engine cylinders. Anobjectof the invention is to provide a machine of the, classset forth,which will be comparatively simple and'inexpensive in constructionand-manufacture, but extremely durable, accurate and veff cient inoperation.

Another object of the-invention is to pro- ,vide a machine ashereinbefore characterized, which will embody ;a novel form.,ofimeanswhereby the grinding, element and the holder thereof maybe readilyandeasily adjusted to proper size for the regrindingof engine cylindersof varyingbore diameters. v I

A further object of theinvention is to pro videa grinding machine ashereinbefore men tioned, which also embodies a ,novel :means forremovably' attaching the ab-rasiveor grinding material to the holdertherefor, and which readily permits of the respacing of the-materialabout theiholder ina manner that successive intermediate active portionsof the same will be brought into; operative position i and the entiresurface may thereby be fully utilized. I

Withztheforegoing and other equally important objects in view, theinventionresides in thecertain new and useful combination, construction'andarrangement of parts as will be hereinafter more fullydescribed, setforthin the appended claims, and illustrated in the accompanyingdrawing,inwhich:

Figure l is a vertical section through a I practical embodiment of thedevice asitappears in operative -ing parts in the several views thereof,the

embodiment of the invention, asshown therein" byway of example, is,constituted'in' an arbor or shaft 10,-which preferably has itslower-end screwrthreadedyas at 11, to receiverelationto an engine cyl- Iinder.

MACHINE 192s. Seria1 l\To. 268,847.

thereon a lock nut or the like 1:2,on which is supported a lowercircular member or disc 13.

Supported on the upper side of this member or disc 13 is an annularmember or washer 14, which has its peripheral edge upwardly bevelled, as90315. Rising from-the upper side of the member or washer 14-is aspacing sleeve 16, which supports'a second circular member or disc 17.Mounted'onithe'upper side of this latter member or disc 17 isa sec- ,10nd annular member or washer 18 also having -its as at "19. r

The arbor or shaft 10 is formed to provide an annular groove 20 at apoint-in the plane 1 of the upper side of the member or washerperipheral edge upwardly bevelled,

18-to receive thereina split member or washer 21against which theseveralpartsbelow the same are clamped when the lock-nut 11 is tightenedupwardly on the-lowerthreade'd .end 11 of the arbor or shaft,andaagainstzthe lower side ofthe bottommember or-disc -13 Both of thecircular members or discs 13 and 17 are each provided with a pluralityof equidistantly spaced and radially extending slots 22, whichopenoutwardly of the'peripheral edges of the same, the several slots of.onerof the members or d1scs;being aligned with-those of tie otherthereof. t

- l Mountedin the c'omplemental.Jslots22 of g at or immediatelyadjacentthe upper ends thereof, are cutaway or notched in a'manner to provideangularly disposededgeportions 2 1, wl11ch,:1n turn, seat agamstthebevelled edge v19 of the upper annular member 'or washerr18. 'Theseveral members or plates 23 are-tensioned inwardlyof theslots221by 1resilient members or springs 25, which have their lower ends attached tothe upper side of the bottom circular'member or plate 13, and-eachofvtheir upper .endsto one side of the membersor plates ease by :meansofv the ends thereof being angularly bent into engagement in suitableopenings formed in the members or plates substantially as shown. Toincrease the natural resiliency of the members or springs 25, theintermediate portions thereof, as at 26, may be bent to circular orother desired form for the purpose. 7

Supported on the upper end edges of the several members or plates 23 isa circular f member or disc 27, which has itsupper side 7 contacted by acircular series of ball bearings or the like 28 carried in a racewayformed in the lower s1de of an ad usting member or nut 29 arranged inthreaded engagement with the upwardly projectingportion of the arbor orshaft 10, which portion of the latter is com- 'plementally screwthreaded to within but a relatively short distance below its extremeupper end. A universal joint or coupling 30 is secured on the extremeupper end of the arbor, or shaft 10 and connects with the lower end of apower shaft 31. Rising from the adjusting member or nut 29 is acylincircled about the outer side edges of the latter with its oppositeend edges disposed in closely spaced relatlon and in a manner to preventthe overlapping thereof. One end edge of the abrasive strip 33 ispreferably providedwith a metal attaching member 3 1, which is formedwith an angularly disposed portion 35 to be engaged in anyone pair ofcomplemental slots 36 formed radially inward ofthe peripheral edges ofthe members or discs 13 and 17 L In the use of the device as thusconstructed and arranged, and with a strip of the abrai sive 'orgrinding material 33 encircled about the periphery of the device, asdefined by the outer side edges of the vertical members 'or plates 23,substantially as shown in Figure 2, the lower end thereof will beinserted downwardly of the bore of an engine cylinder A. Whenoperatively positioned, the abrasive or grinding material 33 will besmoothly. and uniformly pressed against the cylinder wall by the outwardpressure of the radially movable vertical members or plates 7 23. Withthe device properly supported in position, power applied to the uppershaft 31 will be transmitted to the arbor or shaft 10 through the mediumof the coupling 30, when the abrasive or grinding'fabric 33 will berotated against the cylinder wall in an accurate and'effective manner.v

To adjust the'device for use in cylinders of various diameters, theadjusting nut 29 will be either heightened or loosened on thearbor orshaft 10 with respect to the'bearing plate 27 When tightened downwardlyof the upper threaded portion of the arbor or shaft 10, the nut 29forces the bearing plate 27 downwardly on the upper ends of the verticalplates 23, and the latter are forced outwardly of the radial slots 22 inthe circular members or plates 13 and 17 by the cam action of thebevelled edges of the lower and upper washers 1 1 and 18 against thecomplemental angularly inclined edge portions 2a and 2 1 at the lowerand upper ends of the inner edges of the plates 23, and against thetension of the resilientmembers or springs 25, and, conversely, byloosening up on the nut 29, the latter act to withdraw the ver ticalplates 23 inwardly of the slots 22.

To afford a substantial bearing surface to the outer side edges of thevertical members or plates 23, the same are preferably formed to provideangular offset portions or flanges 23, substantially as shown, and whichare also preferably disposed at the trailing sides of the plates 23 withrespect to the direction of rotation of the device. By moving theattachment element progressively from one pair of complemental slots ornotches 36 in the peripheral edges of the circular members or plates 13and 17 fresh portions of the abrasive surface of the strip 33 may bepresented to the work at the outer side edges of the vertical plates 23whenever necessary or desired, and until the entire surface has beenused. The attaching member 34: may be detachably connected at an endedge of the strip of abrasive or grinding material, so as to beremovable for use on replacement strips thereof.

Without further description, it is thought that the features andadvantages of the invention will be readily apparent to those skilled inthe art, and it will of course'be understood that changes in the form,proportion and minor details of construction may be resorted to, withoutdeparting from the spirit of the invention or its scope as claimed.

Having thus fully described the invention, what is claimed is 1. In adevice of the class described, an arbor, a pair of spaced flat circulardisks carried by said arbor, a plurality of circumferentially spacedmembers extending edgewise between said disks and movable radiallythereof, an abrasive element encircling the outer side edges of saidmembers, and means for adjusting said members relatively to said arborand said disks to vary the diameter of said abrasive elementcorrespondingly for grinding engine cylinders and the like ofdifferentsizes.

, 2. In a device oflthe class described, an

arbor, a :pair of spaced circular disks carried by said arbor, aplurality of circumferentially a spaced membersextending between saiddisks by said arbor, a plurality of circumferentially spaced membersextending between said disks and movable radially thereof, resilientmeans for normally sustain ng said members .in contracted relation aboutsaid arbor, an

abrasive element encircling the outer side edges of said members, andmeans for ad usting said members relatively to sald arbor and said disksto vary the diameter of said abrasive element correspondingly forgrmdm'gf engine cylinders and the like of difierent slzes.

4. In a device of the class described, an arbor, a pair of sp-acedcircular disks carried by said arbor, a plurality of circumferentiallyspaced members extending between said disks and movable radiallythereof, resilient means cooperative with each of the said membersfornormally sustaining the same in similarly contracted relation aboutsaid arbor, an abrasive element encircling" the outer side edges of saidmembers, and means for adjusting said members relatively to said arborand said disks vto vary the diameter of said abrasive element,correspondingly for,

grinding engine cylinders and the like of different sizes.

5. In a device of the class described, an arbor, circular discs mountedon said arbor in spaced relation and having a plurality of alignedradially disposed slots opening outwardly of the peripheral edgesthereof, a movable member disposed in each pair of the said alignedslots, an abrasive element en-' circling the outer side edges of saidmovable members, and means carried on said arbor for adjusting saidmovable members radially of said discs to vary the diameter of saidabrasive element correspondingly for grindengine cylinders of differentsizes.

6. In a device of the class described, a

power driven arbor, circular discs mounted on said arbor in spacedrelation and having a plurality of aligned radially disposed slotsopening outwardly of the peripheral edges thereof, means secured at thelower side of said arbor for supporting said discs in position, amovable member "disposed in each pair of the said aligned slots, anabrasive element encircling the outer side edges of said movablemembers, and means carried on said arbor for ad usting saidmovablemembers radially of said discs to vary thediameter of saidabrasive element correspondingly for grinding engine cylinders ofdifierent sizes.

In a id i ez o the class clescribei a arbor-,1 circular discs mounted onsaid arbor in spaced relation and having a plurality of; alignedradially disposed slots open ng outwardly of the peripheral-edgesthereof, a

movablemember disposed in each pair of the aidraligned slots, anabrasive element encirol ngtheouter side edges of said movable members,means for attaching said abrasive'elementto saiddiscs, and means carriedon said-arbor for adjusting said movable members radiallyof said discstovary the diameter :of said abrasive element correspondingly forgrinding engine cylinders of different sizesi 8. in "a .dGVlCGiOf theclass described, an

arbor, circular discs mounted on said arbor in paced relation and havingaplurality of. al gned rad ally disposed slots openlng out- Wardly ofthe peripheral edges thereof, ;a

'movable member disposed in each pair of the saidealigned slots, anabrasive element encircling the outer side edges of said movablemembers, means forv attaching saidabrasive element .to said discs ,atone end only, and meansycarr ed on said arbor for adjustmg 'said movablemembers radially of said discs to vary the diameter of said abrasiveelement;correspond ngly for grinding engine cylindersof clifierentsizes.

9.1] .a device ,of the class described, an arbor, circular discs mountedon said arbor inspaced relation and-having a plurality of alignedradially disposedslots opening outwardly of the periph eral ,edgesthereof, a.

movable member disposed in each pair of the said aligned slots, anabrasiveeleinent encircling the outer side edges of said movablemembers, means, for removablyattaching said abrasive elements to saiddiscs at one end only and means carried on said arbor for adjnsting saidmovable members radially of'said discs to vary the diameter of saidabrasive. element correspondingly for grinding, engine cylinders ofdiiferent sizes 1 0 lnla device of the class described, a power drivenarbor, circular discs loosely mounted on saidarbor, a. sleeve on saidarbor for spacing said discs apart, a lock nut threaded onthe lower endof said arbor for supporting'said discs and said sleeve in positiommembers movable in pairs of aligned slots formedradrally, of said discs,anabrasive element encircling the outer sides of id .inovable members,and means carried by said bar for adjusting said movable membersradially of sa d d1SCS to vary the diameter of said abrasive elementcorrespondingly for grinding engine cylinders of different ,SIZQS.

11. In a device of the class described, a

power driven arbor, circular discs loosely mounted on. said arbor, asleeveon said arbor for spacing said discs apart. a lock nut threaded onthe lower end of said arbor for supporting said discs andsaid sleeve in'position, members movable in pairs of aligned slots formed radiallyofsaid discs, an abra sive element encircling the outer sides of saidmovable members, bevelled annular members carried by said arbor andcooperative with similarly bevelled portions formed with said movablemembers, and a movable means carried by said arbor for actuating saidmovable members relative to said annular members, whereby the same areadjusted radially of said'discs to vary the diameter of saidabrasiveelement for grinding engine'cylinders of difierent sizes. v

12. In a device of the class described, a power driven arbor, circulardisks mounted on said arbor, a sleeve on said arbor for spacing saiddisks apart, a lock nut threaded on the lower end of said arbor forsupporting said disks and said sleeve 1n posltlon, lnembersmovable inpairs of aligned slots formed radially'of said disks, resilient meanscarried by one or" said disks and cooperative with each of the saidmembers for normally sustaining the same in similarly contractedrelation within said slots, an abrasive element encircling the outersides of said movable members, bevelled annular members carried by saidarbor and cooperativewith similarly bevelled portions formed with saidmovable members, and a movable means carried by said arbor for actuatingsaid movable membersrelative to said annular members, whereby the sameare adjusted radially of said disks to vary the diameter of saidabrasiveelement for grinding engine cylinders of different sizes,

l3, In a device of the class described, an

arbor, a pair of spaced circular disks carried by said arbor, aplurality of circumferentially spaced members extending lengthwisebetween said disksand movable radial thereof,

' an abrasive element encircling the outer side edges of said members,said arbor being screw threaded outwardly from the opposite outer sidesof said disks, a lock nut engaged on one of the screw threaded portionsof said arbor and disposed in abutting relation with the adjacent ofsaid disks, means for moving 7 said members relative to said arbor andsaid disks to vary the diameter of said abrasive element correspondinglyfor grinding engine cylinders and the like of different sizes, and meansengageable with the outer of the V threaded portions of said arbor foractuating said last named means. r

" ALVIN B. BERCK.

